Iowa Primary Road No. 12
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| Route information | ||||
| Maintained by Iowa DOT | ||||
| Length: | 46.212 mi (74.371 km) | |||
| Existed: | 1920 – present | |||
| Tourist routes: |
Loess Hills Scenic Byway | |||
| Major junctions | ||||
| South end: |
  US 20 / US 75 at Sioux City
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| North end: |
 Iowa 10 in Hawarden
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Iowa Highway 12 (Iowa 12) is a 46.212-mile-long (74.371 km) state highway that runs from north to south in northwestern Iowa. The highway begins in eastern Sioux City at U.S. Highway 20 (US 20) and US 75. For the first seven and a half miles (12.1 km) of the route, Iowa 12 is an unsigned highway. The first five miles (8.0 km) are signed only as U.S. Highway 20 Business; the other two and a half miles (4.0 km) are overlapped by Interstate 29 (I-29). From here, the highway lies just east of the Big Sioux River, which separates Iowa from South Dakota. The northern end of Iowa 12 is in Hawarden at an intersection with Iowa 10.
Iowa Highway 12 begins at U.S. 20 and U.S. 75 signed as Business US 20. It continues west through Sioux City and becomes concurrent with Interstate 29 going west to Riverside Boulevard, where signage begins. It follows Riverside Boulevard while it passes through the Riverside neighborhood in Sioux City. It passes past Stone State Park in northwestern Sioux City and continues northwest towards Westfield. It turns northeast to enter Westfield, then intersects Iowa Highway 3. Iowa 12 and Iowa 3 overlap and go northeast to Akron, where Iowa 3 turns east. Iowa 12 continues northeast through Chatsworth and ends at Iowa 10 in Hawarden.
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